Double-wall jar



NOV- 10, 1964 M. J. GREBowlEc ETAL 3,156,279

DouBLE-wALL JAR Filed Aug. 29. 1960 United States Patent C 3,156,279 DOUBLE-WALL JAR Michael I. Grebowiec, Kansas City, Kans., and Paul A.

Merchant, Kansas City, Mo., assignors, by mesne assignments, to Rexali Drug and Chemical Company, Los Angeles, Calif., a corporation of Delaware Filed Aug. 29, 1960, Ser. No. 52,716 1 Claim. (Cl. 150-.5)

This invention relates to double-wall jars adapted for packing creams, salves and similar paste-like products, the jar consisting of an outer shell and a liner or inner shell separable from one another.

An object of the invention is to provide a container having an insulated wall and bottom construction effective to retard the action of exterior heat and cold on the con tents of unique construction and properties.

Another object of the invention is to provide a doublewall jar type container which may be provided with variable exterior outer shell shapes with an optionally invariable shell form and with a cavity which facilitates easy removal of the contents thereof.

Another object of the invention is to provide a doublewall jar type container which is of light weight construction and also both resilient and unbreakable.

Another object of the invention is to provide a doublewall plastic jar construction having a blow-molded outer shell which includes the thread finish and an injection molded liner or inner shell which, for various size jars may be made to a predetermined volumetric capacity, the shells positively and securely engageable to a unitary structure.

Another object of the invention is to provide a doublewall plastic jar construction wherein many designs of outer jar with the same thread finish may employ a common, simple inner shell for a given capacity.

Other and further objects of the invention will appear in the course of the following description thereof.

In the drawings, which form a part of the instant specification and are to be read in conjunction therewith, an embodiment of the invention is shown and, in the various views, like numerals are employed to indicate like parts.

FIG. 1 is a plan view of the assembled outer and inner shells of the inventive jar construction with the top removed.

FIG. 2 is an exploded side elevational view of the outer and inner shells.

FIG. 3 is a side elevation of the assembled jar construction with a portion of the jar top cut away to show the thread structure.

FIG. 4 is a vertical section throughV the construction of FIG. 3 showing the engagement of the outer and'inner shells and the application of the top thereto.

Referring to the drawings, at lll is generally designated the inner shell of the double wall plastic jar construction having at least one side wall lila and a bottom wall b. There may be a plurality of side walls in the event that the generally cup-shaped inner shell is desired to be triangular, square, hexagonal, etc. in horizontal cross section. However, preferably, it is circular in horizontal cross section. Inner shell l@ is preferably formed of a semiflexible material such as regular or linear polyethylene. Also preferably, the inner shell is `injection molded for precise shape and volume control. t is con* templated that a given shape, form or capacity inner shell 10 will be employed with various shapes and types of outer shells and be made to a very precise, predetermined volumetric capacity.

Fixed to the upper edge of the inner shell side wall lila and extending substantially radially outwardly therefrom is a ange or rim 16e which is preferably of a certain Patented Nov. 10, 1964 minimum radial extent to be defined. Spaced downwardly from rim or flange 10c on the outer surface of side wall 10a are a plurality of circumferentially spaced, raised or embossed stop means or lugs 10d. Lugs 10d are preferably spaced equidistant from one another and downwardly below rim 10c an equal distance, the latter distance to be more precisely defined. The number of lugs 10d is not critical and may be varied and, in a contempelated modification, may be replaced by a continuous expanded or embossed ring or the like.

At 11 is generally designated the outer shell of the double-wall plastic jar. Outer shell 11 is preferably blow molded, including the thread finish. It is specifically contemplated that the outer shell or jar 11 can be blown into virtually any desired shape or design, at least in the portion below the thread carrying and engaging upper portion thereof, while the inner shell or compartment 10 is maintained relatively more constant in form. In other words, many designs of outer jar with the same thread finish and engagement means may employ a common, simple, inner shell for a given capacity.

The upper lesser internal diameter portion 11a of outer shell 11 has thread nish 11b on the outer surface thereof and is of a height (see FIG. 4) that it will snap lit and be confined between lugs 10d, the upper portions thereof, and the underside of rim libc. Portion 11a must be congruent in form to the upper configuration of shell 1f) to snugly engage therewith. The internal diameter of the upper portion 11a is preferably such as to provide a snug press-fit for the outside diameter of the inner shell directly below flange or rim 10c. The preferred radial extension of rim luc may now be defined as that which completely overlies and covers the top edge llc of the outer shell wall portion 11a whereby to provide a smooth unbroken surface on which a jar cap may seal when the outer and inner jars are assembled.

The outer shell is preferably molded of any suitable rigid or semirigid material, also preferably a material that is not brittle, such as polypropylene or linear polyethylene.

The lower greater internal diameter portion of the outer shell 11 includes a substantially radially extending ange portion 11d fixed to or integral with the lower end of portion 11a, a side wall 11e preferably uniformly spaced or spaced a certain minimum distance at all points from the inner shell wall 10a and a bottom wall llf also preferably uniformly spaced or spaced a certain minimum distance from the bottom wall 10b of inner shell 1u.

A typical top construction generally designated at 12 has a cover portion 12a of suflicient area to completely overlie the top surface of shell 10, including rim 10c. Fixedly attached to or integral therewith is depending flange 12b preferably of sufficient length to substantially abut with its lower end radial flange lld when the underside of cover 12a abuts rim 19C. A thread finish 12e is so formed on the inner surface of flange 12b as to properly engage and disengage thread finish llb on the outer shell upper engaging portion 11a. Cover 12a preferably firmly abuts against the rim or ange 1Go when in position to provide a complete sealing action.

In assembly of the illustrated construction, the inner shell 10 is slipped into the open, upper, lesser internal diameter end of outer shell 1l. When lugs 10d or the circumferential ring alternative thereto abut upper edge 11C, sufficient pressure must be applied to the top rim 10c of shell 1f] to compress resilient shell it) whereby to permit lugs llld to pass under fiange 11d and top edge 1lc to abut the underside of rim or flange 10c. This engagement serves to prevent the inner jar from possibly working upwardly out of the jar assembly proper. y

From the foregoing it will be seen that this invention is one well adapted to attain all of the ends and objects hereinabove set forth together with other advantages which are obvious and which are inherent to the structure.

It will be understood Vthat certain features and subcombinations are of utility and may be employed without reference to other features and subcombinations. This is contemplated by and is within the scope of the claim.

As many possible embodiments may be made of the invention without departing from the scope thereof, it is to be understood that all matter herein set forth or shown in the accompanying drawings is to be interpreted as illus trative and not in a limiting sense.

Having thus described our invention, we claim:

A double wall plastic jar assembly having nested outer and inner plastic shells, said outer shell being blow molded and said inner shell being injection molded; said outer shell having bottom and side walls with a top edge forming an open top, the upper end of said outer shell being necked inwardly to provide a vertical surface having a thread finish, an intermediate portion of said outer shell having a greater diameter than said necked in upper end, a substantially horizontal llange forming part of the side wall of the outer shell, said flange joining said upper end and said intermediate portion to form a continuous side wall with an internal shoulder stepped outwardly immediately below said upper end; said inner shell having side and bottom walls and an open top, the inner shell being removably inserted into the open top of the outer shell to a nesting position within the outer shell, the external surface of the side and bottom walis of the inner shell being completely enclosed by the wall of the outer shell when the shells are in nested position and said upper end of the outer shell engaging the outer surface of the inner shell side wall with a press fit; an outwardly extending continuous rim integral with the periphery of said open top of the inner shell, said rim extending outward to completely overlie said top edge of the outer shell when the shells are in nested position; lug means integral with and extending outwardly from the outside surface or" the side wall of said inner shell, said lug means being located a distance below said rim substantially equal to the distance from said top edge of the outer shell to the bottom of said outer shell llange; said lug means being engaged beneath said iiange when the shells are in nested position to maintain the inner shell within the outer shell; and a closure comprising a cover portion overlying the open top and rim of the inner shell, with a depending integral peripheral frange with an internal thread finish engaged with the thread finish on the upper end of the outer shell.

References Cited in the le of this patent UNiTED STATES PATENTS 2,072,630 Ferry Mar. 2, 1937 2,076,550 Conner Apr. 13, 1937 2,285,614 Rodgers et al `lune 9, 1942 2,776,691 Tupper Ian. 8, 1957 2,805,787 Sherman Sept. 1G, 1957 2,808,090 Casalino Oct. l, 1957 2,895,636 Martin July 21, 1959 3,070,275 Bostrom Dee, 25, 1962 3,096,897 Hansen July 9, 1963 

